USN-3515-1: Ruby vulnerability

Ubuntu Security Notice USN-3515-1

4th January, 2018

A security issue affects these releases of Ubuntu and its
derivatives:

Ruby could be made to execute arbitrary commands if opened a specially crafted file.

It was discovered that Ruby allows FTP command injection.
An attacker could use this to cause arbitrary command execution.

The problem can be corrected by updating your system to the following
package version:

Ubuntu 17.10:: libruby2.3

2.3.3-1ubuntu1.1; ruby2.3

2.3.3-1ubuntu1.1
Ubuntu 17.04:: libruby2.3

2.3.3-1ubuntu0.3; ruby2.3

2.3.3-1ubuntu0.3
Ubuntu 16.04 LTS:: libruby2.3

2.3.1-2~16.04.4; ruby2.3

2.3.1-2~16.04.4
Ubuntu 14.04 LTS:: libruby2.0

2.0.0.484-1ubuntu2.5; ruby1.9.1

1.9.3.484-2ubuntu1.6; libruby1.9.1

1.9.3.484-2ubuntu1.6; ruby1.9.3

1.9.3.484-2ubuntu1.6; ruby2.0

2.0.0.484-1ubuntu2.5

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.